So here how to fix it:
First of all Insert you installation Disk (either DVD or USB Stick)
In Windows 8:
When installation windows appear Click Next - click Repair your computer
click Troubleshoot
click Advanced options
choose Command Prompt
Then type: (press enter to execute the command and do it one by one)
bootrec / fixmbr
bootrec /fixboot
Windows Vista/7:
It is the same method as Windows 8 you need to access the command prompt. to do this insert you installation Disk and select repair. Then select keyboard - Use recovery tools - Command prompt
The type the following command one by one and press enter after each line.
bootrec / fixmbr
bootrec /fixboot
You can also use Bootrec.exe by microsoft instead. I never try it and it is a lot to explain how to use this tools. so I just write the easiest method to fix this =p
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